Experiment study on strata behaivors law of mining face with outburst risk coal seam under thrust fault

In order to figure out the effect of F16 large thrust fault to five produotion mines in Yima Mining Area,a large similar model was built. During the model buildi ng,the fractal features of fault plane and occurrence characteristics of overburden on both sides of fault were considered. According to the monitoring results of displaceme nt and stress,the characteristics of overburden movement and strata behavior law was studied with mining face advance to the fault. It was found that the overburden " thre e- zone" was obvious and the floor was unaffected before the mining face entered to the influence scope of fault. After the mining face was in zone,the roof abscission laye r amount had a leap- growth and the stress in floor reached maximum,the fault was activated. When the working face crossed the fault a certain distance,with the length of cantilever rock beam increasing,the working face coal wall was yield failure and the floor stress increased. After the cantilever rock beam broken and its bearing stress rele ased,the floor stress decreased. Meanwhile,the " Short Voussoir Beam" structure which above mining face cut down and slide along the bedding.